Marine reduction reverse gear unit



Jilly 14, 1931. P. D. HARVEY 1,814,311

MARINE REDUCTION REVERSE GEAR UNIT Filed Oct. I51, 1927 Patented July14, 1931 1314 3-11.

UNITED STATES- PATENT oFFicE;

PAULD. HARVEY, OF CHICAGO, ILLINOIS MARINE REDUCTION REVERSE. GEAR UNJIT Application filedOctober 31,1927. Serial No. 229,892.

This invention relates to marine reduction main gear shaft 12 issupported in bearings reverse gear unitsfor gasoline engines and 14mounted in the casing division wall 15. its primary object is to providenovel and These bearings are held in position by a compact driving meansarranged within a collar 16 which is fastened to an annular 6 unitarycasing which may be detachably flange 17 integral with the division wallconnected to any S. A. E. gasoline engine and takes up the lateralthrust of the main bell housingand which will drive a propelgear shaft12. A packing gland nut 18 is ler at a low speed from a relatively smallarranged about the main gear shaft 12, Fig.

high speed engine andlstill produce the same 1, to form a tightconnection bet-ween the 10 power to the propeller shaft as would becompartment 19 and the compartment 7 obtained from a relativelylarge lowspeed within the casing. engine. The outer end of the main gear shaft 12Another object is to provide novel driving is supported in suitablebearings 21 in the means which will reduce slippage, of the end of the.casing and is threaded'at 22 to propeller, prevent churning, and therebyreceive the lock nut 23. These bearings are increase the power byslowing down the freectomove laterally between the nut' 2 3; A

R. P. of the propeller shaft. which limits-the movement of the bearingsnother object is toprovide improved in one direction, and the shoulder24, on

means for driving a propeller from the fly the main gear shaft 12 whichlimits the wheel end of a marine engine to reduce the movement of thebearings in the other ditorsional strain on the crank shaft, whichrection. will beanore economical operation, which A counter shaft 25 ismounted in suitable can be readily and economically manufacbearings 26and 27 in the division wall 15 tuned, and which can be easily andquickly and the casing end wall and is splined .be-

= 25 1i d t any t of S. A. E. engine bell tween the bearings at 28, F 2.A driven .wt n t e earis. the1inaeaeaea -th housing. 7 herring bone gear29 floats on the splined In the accompanying drawings illustratportionof the-shaft 25 andmeshes with the ing a-selected embodiment oftheinvention driving gear 13. 'The bearing 27 is convthe views are asfollows: fined between the annular flange 30 and the 30- Fig. 1 is ayertical sectional view of packing gland 31 and takes up the end unitapplied to a standard E. bell thrust of the counter shaft 25. Thepacking housing. 7 I i gland 31 is suitably fixed to the casing 3 byFig. 2, is a. transverse sectionalvie-w taken bolts 32 and is threadedat its outer end to onthe line 2 2 of Fig. 1. receive the cap 33. Apropeller shaft driv- Referring to the drawings 1; designates an ing.flange 34 is suitably keyed to the counter engine fly Wheel-suitablyarranged within shaft 25.to whichthe propeller shaft flange an S. A. E.bell housing 2 to which .cas- (not shown) is connected. ing 3 isdetachably connected. The casing 3 has an pening 35 provided he flywheel 1 is recessed at 4 to receiye the top thereof so that parts of thedrivthe end 5 of the stub shaft 6. A eollar i lng mechanism may beinserted thereis spline on the stub shaft 6 and fastened through.Suitable covers 36, 36 are attached to the engine fly wheel 1 by meansof, suitto the-top of the casing to seal the same. An

able bolts 8. A driven shaft-1f) issu-itably opening may be provided inthe bottom' supported in the casing 3 and -1S operatively of the casingto allow the oil to be drained 5 connected to the stub. shaft 6 and-itcarries therefrom. The opening 37 is sealed in any planetary reversemechanism 10 which is convenient manner such as by a pl'u not operatedby a clutch arm 11. r

main gear shaft 12 is operatively con- Thecasinghas an opening 38 at itsinner t h P a t r te th .nected to the driven shaft 9 andcar ie end soanemia d geare'seeeaatse:

, of straps, or o herwise.

' ard S. A. E.

formance as an engine mechanism may be inserted in the casing as asingle unit. A removable end plate 39 is fastened to the casing to sealthe casing and to form a suitable bearing for the hub L0 of theplanetary reverse gear mechanism.

A removable plate 4:1 may be provided at the outer end of the casing toallow ready access to the bearings 21.

In assembling the mechanism in the easing, the driven gear 29 isinserted through the top of the casing and allowed to rest in the bottomof the compartment 20. The planetary mechanism and the main gear shaftwith the bearings l l and 21 in position thereon are inserted throughthe opening 38 as a complete unit to occupy the position shown in ig. 1;the planetary gear mechanism being supported by oppositely disposedflanges 42 integrally formed on the inside of the casing until the endplate 39 is bolted in place. The driven gear 29 is then lifted intomeshing position with the driving gear 13 and held in place by means Thecounter shaft 25 isthen slipped through the casing from the rear endthereof and inserted through the driven gear 29 and into the bearings 26previously inserted. The packing gland 31 is then bolted in place, thecap 33 is secured to the gland, and the mechanism is properly positionedin the casing. The casing containing all the mechanism is then bolted totheengine bell housing which is a simple operation as the shaft 6 issplined and is readily received within the hub 4E0 of the planetarymechanism. 2

The flanges 42 also act as stops to prevent the hand l3 from turningduring the reverse operation of the planetary gear mechanism.

From the above it is apparentthat I have provided a compact and unitarystructure suitably arranged within a single casing which may be readilyapplied to any standbell housing. The complete unit is light in weightand when applied to a small engine will renderthe same pertwice its sizeand power without employing the use of my reduction gear unit. Thecasing is made in one piece, is light in weight and'is a distinctdeparture from the conventional'two-piece casing ordinarily used.

Changes may be made in the form, construction and arrangement of theparts without departing from the spirit or sacrificing any of theadvantages of the invention, and

I reserve the right to make all such changes as fairly fall' within thescope" of the following claims: V

" I claim: e

1. In a marine reduction reverse gear unit, a one-piece housing havinganinte'gral dividing wall defining two compartments and having openingsin the walls of each jacent the end pair of 'said' with the shaft, andmeans for preventing axial'move-f compartment for accessibility to theinterior thereof, one of the end walls of said housing and said dividingwall having aligned openings therein, hearings in saidopenings, a drivenshaft journaled in said bearings and extending across onecompartment andinto the other compartment, a herringbone gear fixed on the portion ofsaid shaft extending across said compartment, said dividing wall andsaid end wall i having other aligned openings therein, bearings in saidopenings, a counter-shaft journaled in said bearings and extendingacross the compartment adwall and parallel with the first shaft and outthrough said bearing to extend beyond said end wall, said shaft having asplined portion thereon, another'herring bone gear meshed with sa'dfirst named herring. bone gear and mounted on the splined portion ofsaid shaft, the intermeshing of saidherring bone gear preventing axialmovement of said other'herr'ing bone gear on said splined portion, areverse unit including a shaft connected to the end of said driven shaftextended into said other compartment, a packing gland arranged aboutsaid driven shaft in the compartment containing said reverse unit, platefor closing the opening in said end wall having the bearing therein inwhich said driven shaft is journaled, a plate for closing the opening insaid dividing wall in which a bearing for said counter-shaft isjournaled, and apacking gland on said end wall about said shaftextending beyond said end wall.

2. In a marine reduction reverse gear unit, a housing including an endwall and dividing wall defining a compartments' therebetween and havingan opening in a wall intermediate said dividing wall and said end wallaffording access into the compartment, said dividing wall and end wallhavingaligned openings therein, bearings in said openings, a drivenshaft journaled in a air of said bearings, a herring bone gear fixed onsaid shaft intermediate said bearings, a counter-shaft journaled inanother bearings'and having a splined portion thereon intermediate saidbearings, another herringbone gear introduced into said compartmentthrough said opening in the wall intermediate saidend wall anddiin' whereby said counter-shaft may be slid through the bearingin theend wall therefor to permit the splined portion thereon to be passedthrough said splined bore after said other'herring bone gear has beenmeshed herring bone gear on said driven ment of said counterhaft afterinterconnection thereof withsaid other herring bone gear, V v v I v 7v3). comprising a one-plece A marine reduction reverse gear'unit''hOUSHIg having a dividing wall and an end wall integral therewith, aremovable end Wall at the other end of said housing, said removable endWall having an opening therein through which a driving shaft may beextended, means preventing leakage past said driving shaft, a planetaryreverse unit connected to said driving shaft and arranged in said ofsaid dividing wall, and said integral end openings therein, bearings insaid openings, a driven shaft journaled in said bearings and extendingacross the compartment intermediate said dividing and integral end wall,means connecting said driven shaft to the output end of said reverseunit, a herring bone gear on said driven shaft intermediate saidbearings, means for preventing leakage of lubricant past said bearings,said dividing wall and integral end wall having other aligned openingstherein, bearings in said openings,-a counter-sl1aft journaled in saidbearings and having another herring bone gear mounted thereon and meshedwith said first-named herring bone gear, said counter-shaft, 9X- tendingout of said casing beyond said integral end wall, a packing gland aboutsaid counter-shaft exteriorly of said end wall, and means preventingleakage past thebearing for said counter-shaft in said dividing wall. Y

PAUL D. HARVEY.

